To unarchive a chat. Archived chats will unarchive when you receive a new message from that chat. You can manually unarchive a chat by searching for a contact name or message from that contact: In the Archived Chats screen, slide your finger across the chat, from right to left.
Parkinson's disease in most people is idiopathic (having no specific known cause). However, a small proportion of cases can be attributed to known genetic factors. Other factors have been associated with the risk of developing PD, but no causal relationships have been proven.
The estimated prevalence of idiopathic dilated cardiomyopathy is 0.4 per 1,000 of the general population. However, in the future, as more causes are elucidated and more patients are found to have genetic or familial cardiomyopathy, the number of patients with idiopathic disease, a diagnosis of exclusion, will decrease.